Major need of help!!!
#1
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Major need of help!!!
OK so i have a GM mercrusier 468 in a boat that last year dropped a valve on #5 cylinder. So i went through the motor and had it dynoed and all was well. When I put it in the boat it ran great. I have stainless marine exhaust with short risers. I was concerned with reversion so after running it for a bit I noticed that I had alittle water leaking from the band clamp that holds the riser to the manifold. I pulled the manifold and one side looked good and dry. The other side looked like it had water beads in the #5 cyliner exhaist runner. I pulled the manifold and made a pressure testing rig from a automotive pressure tester. I dunked the manifold in a big tub of water and presssured it up to 30 psi. No bubbles or leakage. Could the riser leaking be a sign? If so why would it leak into only one cylinder? Have asked to many so called professionals and am at a loss. Need some input.
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Thats the kind of things I want to hear.Man I ready to put this thing in the water but dread having to open the motor back up. It just seems weird to me that it is on the same cylinder that had the problem before. With the exhaust off it looks like that side had some traces of water but # 5 looked like it had been exposed to more that the rest. This was the side that looked like the exhaust riser was leaking the worst. And looking at the riser gasket you can tell it wasn't sealed.